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       1                 :            : /* version.c -- Version handling.
       2                 :            :  * Copyright (C) 2002-2012 Simon Josefsson
       3                 :            :  *
       4                 :            :  * This file is part of GNU SASL Library.
       5                 :            :  *
       6                 :            :  * GNU SASL Library is free software; you can redistribute it and/or
       7                 :            :  * modify it under the terms of the GNU Lesser General Public License
       8                 :            :  * as published by the Free Software Foundation; either version 2.1 of
       9                 :            :  * the License, or (at your option) any later version.
      10                 :            :  *
      11                 :            :  * GNU SASL Library is distributed in the hope that it will be useful,
      12                 :            :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13                 :            :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14                 :            :  * Lesser General Public License for more details.
      15                 :            :  *
      16                 :            :  * You should have received a copy of the GNU Lesser General Public
      17                 :            :  * License License along with GNU SASL Library; if not, write to the
      18                 :            :  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
      19                 :            :  * Boston, MA 02110-1301, USA.
      20                 :            :  *
      21                 :            :  */
      22                 :            : 
      23                 :            : #include "internal.h"
      24                 :            : 
      25                 :            : #include <string.h>               /* for strverscmp */
      26                 :            : 
      27                 :            : /**
      28                 :            :  * gsasl_check_version:
      29                 :            :  * @req_version: version string to compare with, or NULL.
      30                 :            :  *
      31                 :            :  * Check GNU SASL Library version.
      32                 :            :  *
      33                 :            :  * See %GSASL_VERSION for a suitable @req_version string.
      34                 :            :  *
      35                 :            :  * This function is one of few in the library that can be used without
      36                 :            :  * a successful call to gsasl_init().
      37                 :            :  *
      38                 :            :  * Return value: Check that the version of the library is at
      39                 :            :  *   minimum the one given as a string in @req_version and return the
      40                 :            :  *   actual version string of the library; return NULL if the
      41                 :            :  *   condition is not met.  If NULL is passed to this function no
      42                 :            :  *   check is done and only the version string is returned.
      43                 :            :  **/
      44                 :            : const char *
      45                 :          4 : gsasl_check_version (const char *req_version)
      46                 :            : {
      47 [ +  + ][ +  - ]:          4 :   if (!req_version || strverscmp (req_version, GSASL_VERSION) <= 0)
      48                 :          4 :     return GSASL_VERSION;
      49                 :            : 
      50                 :          4 :   return NULL;
      51                 :            : }